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True stress-strain curves obtained in tension tests at temperatures ranging from —196° to +100° C with ingot iron as annealed, normalized, quenched and tempered, hot-rolled and cold-drawn are presented. Numerous simultaneous load and diameter measurements were made during the entire course of each test. The effects of prior thermal and mechanical treatment of the iron on the true stress-strain relations are discussed. Graphs are presented showing the influence of the testing temperature, the ferrite grain size, and the initial condition of the iron on the work-hardening characteristics, namely, strain-hardening and strain-aging. * The effects of the above factors on yield stress and ultimate stress, and on true stress and true strain at maximum load and at fracture, are presented. The twinning of iron in the tests at low temperatures is. briefly discussed.

Tensile properties of ingot iron at low temperatures